rock tripe
An edible lichen used in traditional medicine in Korea, China, and Japan. Typically referred to by its katakana name.
Rock tripe is a lichen that grows clinging to rock surfaces.
In Korea, dried rock tripe is sometimes used as an herbal medicine.
Kanji spelling using 岩 (rock) and 茸 (mushroom); less common than katakana.
Alternate kanji spelling using 石 (stone); rarely used.
The name literally means 'rock mushroom' (岩/石 + 茸). The exact origin is uncertain, but it describes the lichen's appearance and habitat.